exoplanet

• exo-planet

Constructed from Ancient Greek: exo- +‎ planet.

exoplanet (plural exoplanets)

1. (astronomy, planetology) A planet which exists outside Earth's solar system.
   • 2007, Alexander Hellemans, "Dangling a COROT", Scientific American, vol. 297, no. 3, p. 32:

     More such announcements will likely come in the months to follow, as the first space observatory dedicated to hunting exoplanets, called COROT, begins full operation and researchers complete their calculations.

   • 2013 May-June, Kevin Heng, “Why Does Nature Form Exoplanets Easily?”, in American Scientist, volume 101, number 3, page 184:

     In the past two years, NASA’s Kepler Space Telescope has located nearly 3,000 exoplanet candidates ranging from sub-Earth-sized minions to gas giants that dwarf our own Jupiter. Their densities range from that of styrofoam to iron.

• exosolar planet
• extrasolar planet

• exocomet
• exomoon

• planetary system